Google's about to upgrade its Google Glass hardware with new features, and the satisfied nerds already in possession of a pair of the tech-specs will be able to swap their existing Glass for a new one later this year.

According to Google, the enhanced Google Glass will be compatible with "future lines of shades and prescription frames," while anyone who bought their augmented reality voyeur system before October 28th can swap their current model for the new hardware. And to help spread the menace, all existing owners will be granted the option to invite three friends to join the sort-of-beta trial. [Google via Ars]